This past weekend in college football was wild. Lots of top 25 teams fell and some Heisman hopefuls suffered major blows.

Just a week ago, I profiled the shallow group that makes up this Heisman race. This time around, I’m back to break down why each of the true contenders won’t win this years award. These are the front runners for the award and while it is still early, we are starting to see the full picture on the candidates. Let’s be clear, all of these players have had phenomenal seasons so far. This is explaining why they still might not win the Heisman.

Kyler Murray, QB, OklahomaFlaw: Offensive System
This might seem a bit unfair to Murray, as it isn’t his fault Lincoln Riley is a great head coach, but Oklahoma also produced Baker Mayfield last year. When you compare the two, Murray is putting up comparable numbers. Mayfield averaged 330 yards passing per game with three touchdowns and a completion percentage of 70.5 in 14 games. Murray is averaging 294 yards with 3.5 touchdowns and a 71.1 completion percentage. Murray produces more with his legs as he accounts for 62.8 yards per game rushing compared to Mayfield’s 22 yards per game during his Heisman season.

Riley is an offensive mastermind and playing in the wide open Big 12, this system is amplified an extra step. It is hard not to wonder if Murray is simply benefiting from the same system that turned Mayfield into a landslide Heisman winner. Voters will be wary of voting in a different player at the same position from the same school as they did the year before. Only once in the history of the award has a school had back-to-back winners. It happened back in 1945-46 when Army produced two different Heisman winners in as many years. These are all things Murray cannot control, but that does not mean they will not come into play when it comes time to vote.

Tua Tagovailoa, QB, AlabamaFlaw: Importance to teamWhen was the last time it felt like a team could still win the national championship without its Heisman candidate? Alabama is dominating everyone who steps on the field with them. The Crimson Tide is outscoring opponent’s by an average margin of 40 points per contest. After years of being known as a defense team, Nick Saban is boasting an offense to match it. At the center of it is Tua Tagovailoa. He is putting up incredible numbers, putting up video-game-like numbers. He has completed 75 percent of his passes, averaging 14.8 yards per attempt and has the highest passer rating in the country at 258.4.

However, he barely has to play when it matters, because it often doesn’t for Alabama. He has attempted more than 20 passes in a game only once. Tagovailoa has not taken a single snap in the fourth quarter of a football game this season. By that point, the Tide has been up by enough that his services are no longer needed. ‘Bama is far and away the best team in the country and Tagovailoa might be the best quarterback in the country, but this team seems like it would easily make it back to the playoff if it was only relying on Jalen Hurts. In limited playing time, Hurts has completed 71 percent of his passes with five touchdowns and only one interception. If the system issue for Kyler Murray was bad, this seems almost worse in Alabama where there is another quarterback performing well in the same season. It is difficult to poke holes in Tagovailoa’s campaign, but equally hard to say he should be the Heisman winner when it feels like the team would be fine without him.

Will Grier, QB, West Virginia:Flaw: GunslingerWill Grier has had one heck of a year so far. He has thrown for at least 330 yards in every game. He is completing 71 percent of his passes. He is also averaging a ridiculous 4.2 touchdowns passes per game. Grier has proven he can toss it all over the yard. He has West Virginia up to number six in the polls, its highest ranking since 2012. While the level of competition the Mountaineers have faced is certainly a concern, they have yet to play another ranked team and likely won’t until November, the much bigger concern is Grier’s playing style.

Much like Kyler Murray, Grier plays in the wide open Big 12. It serves up opportunities for tons of passing yards and weak secondaries to feast on. Heading into the game, he had only thrown three interceptions. Against Kansas, Grier tossed three more. Throwing three interceptions in a game is not a good thing. Throwing three interceptions against Kansas. The Jayhawks are 2-4 this season, including a loss to Nicholls State, an FCS team. Grier’s now six interceptions rank him tied for sixth most in the country. That is not an awful thing, but when you compare him to the other Heisman candidates, it is a bad look. Haskins has four, Murray has two and Tagovailoa has yet to throw one. Each of those three has played one more game than Grier as well. It begs the question of how Grier will fare when faced with top tier teams like Texas and Oklahoma, both of whom West Virginia will play next month. If Grier turns it over against those teams, not only will it likely cost his team the game, it will certainly cost him the Heisman.

Dwayne Haskins, QB, Ohio StateFlaw: Starting slowIf there is anyone in college football who is putting up the kind of number Tua Tagovailoa has, it is Dwayne Haskins. He has completed 71 percent of his passes en route to averaging 320 yards per game through the air. Haskins also leads the nation in touchdown passes through six games with 25. Looking at Ohio State’s schedule, it should relatively smooth sailing for them heading into their final game of the year against Michigan.

In the last two games for the Buckeyes though, the team has started rather sluggishly. Against Penn State, Haskins threw an early interception which lead to a field goal. Ohio State went down 13-0 and it probably would have been that score at halftime if not for a costly fumble from the Nittany Lions. Haskins played very well in the second half to lead Ohio State to a victory. Essentially the same script played out again at home against Indiana. Haskins threw a second quarter interception to kill the drive and set up a Hoosier touchdown, which put Indiana ahead at that point. He played lights out in the second half, but the lack of a complete game is troubling. The Big 10 is a tough conference to compete in and Ohio State has road games with Purdue, Michigan State and Maryland left. None of those poise serious threats, but going down early in games is not sustainable for any team. I guess if Haskins continues to do it, you could label as clutch, but it raises a red flag for me indicating he takes a little while to settle into a game.

Travis Etienne, RB, ClemsonFlaw: Pass CatchingI said Etienne was getting close after his dominant performance against Syracuse. After thrashing Wake Forrest, Etienne earns himself the title of Heisman contender. He is fourth in the nation with 761 yards rushing, third for his yards per carry average of 9.2 and tied for fourth with 11 rushing touchdowns. His value cannot be overstated for a Clemson team that had its former starter Kelly Bryant transfer and now starts a true freshman under center. Against Wake Forrest, Etienne racked up 167 yards and three touchdowns on just 10 carries. He is an explosive playmaker on a top team in the country.

The one major concern Heisman voters will have with Etienne is he doesn’t fit the bill of a true Heisman back. He is not a powerful runner in the way that Mark Ingram or Derrick Henry, the last two running backs to win, were at Alabama. Much like Tua Tagovailoa, he is not a heavy usage player running the football as he has eclipsed 16 carries just once. We’ve seen plenty of running backs add to their candidacy by featuring as pass catchers out of the backfield on swings, screens and wheel routes downfield. On the season he has just five receptions for 27 yards and one receiving touchdown. It is not a requirement to be a good receiving back to win the award, Henry finished his winning season with just 11 grabs, but with Etienne not putting up nearly the same numbers running the ball as those that came before him, it is going to be difficult to outshine any of these quarterbacks without making an impact in the passing game.